The three most abundant gases in our atmosphere are nitrogen, oxygen, and argon

Indicate whether the statement is true or false


TRUE

Physics & Space Science

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Green light emitted by excited mercury vapor corresponds to an energy transition in the mercury atom. A more energetic transition might emit

A) red light. B) blue light. C) white light. D) any of these

Physics & Space Science

The ________ Belt bodies orbit beyond Neptune, but like the planets stay close to the ecliptic plane and in fairly circular orbits

Fill in the blank(s) with correct word

Physics & Space Science

The disintegration energy for gamma decay of a nucleus is typically on the order of 10-100 keV and can even be on the order of MeV. Which of the following statements best describes why the energies are so much larger than from atoms?

a. Energy levels within the nucleus are spaced farther apart than atomic levels. b. The spins of the paired protons and neutrons within the nucleus are aligned within energy levels. c. The higher energies of the gamma rays are higher in probability of emission because they must tunnel through classically forbidden regions. d. All nuclei are only metastable, increasing binding energy exponentially when the nucleus is in an excited state. e. The Coulomb attraction within the nucleus places it lower in energy, therefore greater excitation energies are necessary.

Physics & Space Science

The fact that nearly all galaxies are moving away from us, with more distant ones moving faster, helped us to conclude that:

a. The universe is expanding. b. Galaxies repel each other like magnets. c. Our galaxy lies near the center of the universe.

Physics & Space Science